Microsoft is crrraaaazy about the cloud these days, and they're using OneNote Mobile, a free companion app to their popular lists and notes software, to get iPhone users on board. Naturally, it syncs seamlessly with Windows Live SkyDrive.

The OneNote iPhone app, free for a limited time, lets you make lists and take notes that can include text, photos, checkboxes and bullet points which can be organized into various color-coded sections. And thanks to Windows Live, OneNote possesses the one crucial note-taking feature: syncing. With a Windows Live ID, your notes get stored in the cloud, allowing you to get at 'em from the PC software, a web app, or the iOS or Windows Phone 7 apps. COOL! And perhaps this means we'll be seeing other Office apps in the App Store soon. [iTunes]